The Ministry of Research was entirely too quiet.
For the first time in months, there were no sudden detonations echoing down the halls. No thick, acrid plumes of purple smoke clinging to the high ceilings. No junior assistants sprinting for their lives with charred clipboards. It was completely still, and the absolute silence was making the senior staff profoundly uncomfortable.
"Is Director Sunveil actually working normally today?" one researcher whispered, peering cautiously around a massive marble pillar.
"Should we evacuate?" another muttered, clutching a stack of incident reports. "Honestly, I think I preferred the explosions. At least with the smoke, you knew where you stood."
Deep within the restricted testing wing, Kairos Sunveil stood alone inside a reinforced circular chamber. Concentric rings of silver runes covered the floor beneath his boots. Floating measurement lacrimas and observation crystals hovered overhead, silently recording the ambient ethernano density.
Outside the heavy observation glass, Siris held a clipboard, his expression as stiff as his collar. "Begin Test Number Forty-One," his voice echoed through the communication array.
Kai rolled both sleeves up past his elbows. Beneath his skin, the ancient Kaldor runes shifted. They moved almost imperceptibly, constantly rearranging their microscopic pathways like living circuitry.
"They're altering their structure," a technician murmured, leaning flat against the glass.
"They aren't changing shape. They're just active," Kai corrected mildly through the audio feed. He raised his right hand, conjuring a faint, unremarkable sphere of light above his palm—a basic academy illumination spell.
The technician squinted at a glowing monitor. "Wait. Check the mana consumption."
"Forty-two percent lower than his baseline," another replied, checking the dials twice. "That's impossible. The output is identical. Where is the compensation coming from?"
Kai extinguished the light with a casual flick of his wrist. "It isn't producing more power. It's just wasting less. Traditional spellcasting bleeds energy during circulation. This layout recycles the bleed-off before it can escape my system."
"Director..." The senior researcher stared through the glass. "If these numbers scale, your practical endurance is up by nearly forty percent."
"What's the literal value?" Kai asked, wiping a smudge of chalk on his trousers.
"Thirty-seven percent, sir."
Kai glanced down at his forearms. "As expected. My actual reserves haven't changed. I still possess a thoroughly mediocre pool of ethernano. I've just minimized the friction."
"Which effectively simulates a much larger reservoir," Siris noted. "Let's move to Test Forty-Two."
A measuring lacrima drifted lower. Kai closed his eyes, and the silver lines beneath his skin flared to a sharp, cold silver. For a few seconds, the air stayed still. Then, every crystal in the room twitched. The invisible currents of ambient ethernano floating through the chamber began drifting toward Kai—surging toward him like air rushing into a vacuum.
"Ambient absorption is climbing," the technician read off the gauges. "One hundred twelve... one hundred fifty percent..."
Kai opened one eye. "The script recycles my internal energy first. When the reserve drops past a fixed threshold, the runes automatically pull from the environment to stabilize the pressure. There are hard limits coded into the sequence to keep my nervous system from frying."
The Kaldor civilization had built these specific arrays to manage energy across entire cities, pulling power from grid failures and recycling waste.
A researcher chuckled nervously into his sleeve. "Well, that's reassuring, sir. Absorbing ambient ethernano past those safe limits would likely liquefy your internal organs."
"True. Under normal conditions," Kai said, looking directly at the glass. "But since I integrated them into my own pathways, I've been wondering: what happens if I manually bypass the regulatory circuits?"
Siris immediately dropped his quill. "Director, I strongly advise against—"
Kai ignored him. He pulled up a glowing projection of his runic layout, and with a swift, practiced gesture, cast a localized dismantling spell over his own chest and navel. The regulatory runes dissolved. Before anyone could shout, he grabbed a silver engraving pen and sketched a volatile redirection script directly onto his skin.
The lines blazed blindingly bright.
The air inside the chamber turned heavy enough to crush bone. The gentle ambient streams accelerated into violent, roaring currents. Red warning runes flashed across the observation glass as the crystals began to scream.
"Absorption is breaking the scale!" the technician yelled over the alarms. "Four hundred percent! Seven hundred!"
The light in the room seemed to dim, sucked entirely into the center of the chamber. Kai's heavy coat whipped wildly without wind. When his golden eyes snapped open, his pupils were gone, replaced by spinning, intricate geometric patterns.
Then, the feedback loop hit.
Kai gasped, his posture instantly collapsing as his knees buckled. The silver lines on his skin didn't just glow; they began to violently blister. The raw magical pressure radiating from his silhouette spiked into an erratic, jagged spike that cracked the reinforced glass.
The primary measuring lacrima groaned under the strain, cracked, and imploded into dust.
Siris slammed his fist onto the manual override. "Enough!"
The silver light snapped out. The rushing currents died instantly, dropping the air pressure back to normal. Kai hit the floor on one knee, exhaling a single, ragged breath.
A heavy trail of blood spilled from his nose, accompanied by dark crimson leaking from his left ear. His fingers were trembling so violently he couldn't grasp his handkerchief.
*"My calculations were off,"* Kai muttered, his voice hoarse and strained. *"The biological resistance of human nerve endings doesn't scale linearly with ancient city-grid formulas. I assumed a static decay constant. I was wrong."*
"You just forced your nervous system to process eight times its physical capacity based on an unverified hypothesis!" Siris shouted through the comms, visibly pale.
Kai tried to flex his right hand, but his fingers remained locked in a tight, rigid spasm. "The script works, but the bio-interfacing is fundamentally flawed. I don't know how to bridge the biological thermal variance yet. If I can't find a dampening variable, the next test will burn out my nerves."
Siris stared at him, then pulled up the vitals report, his face grim. "Muscular fatigue, temporary loss of fine motor control, severe neurological strain, and minor internal bleeding. Testing is permanently suspended."
Kai looked down at his trembling, blood-flecked hands, a rare expression of deep frustration flitting across his face before he masked it with a faint, forced smile. "Suspended is fine. I need to take a step back and rewrite it to support biological baseline from scratch anyway. It's... a lot more complicated than I anticipated."
Siris closed his ledger with a sharp click. "Medical wing. Now."
Exactly thirty minutes later, Kai walked out of the medical wing sipping a carton of fruit juice, though his left leg dragged slightly with a lingering numbness.
The head physician had ordered him to stay in bed for six hours. Kai didn't have six hours. He had managed to corner an innocent junior nurse, used a hefty stack of Jewels, and asked her to corner the physician with seventeen consecutive, hyper-technical questions regarding advanced hepatic cell regeneration. It had bought him exactly thirty-three seconds of utter bureaucratic chaos.
It was plenty of time to jump out the window.
Grinning at the memory, he pushed open the heavy double doors of Development Hall Three.
Unlike the clinical, quiet atmosphere of the rune labs, this hall looked entirely industrial. Long workbenches were buried under copper conduits, crystalline gears, and half-assembled relay arrays. At the center of the room sat two massive prototype communication lacrimas mounted on bronze frames. Their glass faces flickered with a faint, nauseating purple twitch.
The lead engineer groaned the second Kai crossed the threshold. "Director."
"Hey, team," Kai said, walking over to the bench. "Still tearing?"
"We haven't stabilized the signal since yesterday afternoon," the engineer admitted, looking thoroughly defeated.
Siris entered the hall a minute later, carrying three heavy leather folders under his arm. "Good morning, Director. I see you've successfully escaped custody." He dropped the folders onto the desk. "Weekly progress reports, budget clearings, and project approvals."
Kai looked at the surprisingly thin stack. "That's it? Where's the rest of the mountain?"
Siris's expression remained perfectly deadpan. "The rest was processed last night. The accounting department requested that I formally inform you that your 'I'll Do It Eventually' file system has made you the most hated man in the palace."
Kai smiled faintly, leaning his hip against the bench. "When they can't match the intellect, they resort to petty resentment."
"...I don't think that's the issue, sir. They spent three months assuming that paperwork had been vaporized," Siris noted dryly. "They were at peace. Then, yesterday at four o'clock, every backlogged tax exemption and research grant materialized on their desks simultaneously. Six clerks had to be sent home weeping."
"Weaklings," Kai murmured, turning his attention to the prototype.
One of the communication crystals buzzed, its internal matrix humming as it established a connection. A second later, the receiving crystal caught the signal, but the projection warped instantly. Kai's face appeared on the screen, except it currently had three distinct, overlapping noses and a heavily distorted jaw.
Kai stared blankly at his own reflection. "...Fascinating. I appear to have achieved a higher plane of existence."
A few researchers snickered. Siris just sighed.
"We fixed the transmission lag by dumping more raw power into the core," the lead engineer explained, pointing at the schematic. "But the visual synchronization falls apart after five seconds. The individual image layers aren't hitting the receiver at the exact same millisecond. The feed just tears itself to pieces."
Kai crouched down, studying the copper wiring beneath the glass. He tracked the rhythmic pulse of the rune arrays, staying entirely silent for three full minutes. The workshop grew quiet around him.
"Walk me through the data path, Testicle," Kai said without looking up.
The lead researcher massaged his temples. "...It's Tatsuya, sir. We're running the standard thought-projection method used in basic communication lacrimas. The sender project pushes the image, and the relay towers bounce the continuous magical feed to the receiver."
Kai straightened up, shaking his head. "That might be your structural flaw. You're treating magical information like a single, solid boulder. A visual projection is made of thousands of independent light fragments. Stop trying to transmit a living, continuous canvas. Break it down. Program the core to only transmit the changing ten percent of the visual field and cache the background."
"That..." The assistant engineer whispered, his hands shaking as he pulled over a fresh sheet of parchment. "If ninety percent of the background remains cached... the synchronization tearing vanishes locally."
"Locally, yes," Tatsuya agreed, but his face fell as he held up a separate, thicker telemetry file. "But that only fixes the short-range feed, Director. We ran a mock relay simulation out to fifty miles. Past the border of the capital district, the audio and visual channels don't just tear—they dissolve entirely into corrupted white noise. The signal degrades exponentially."
Kai scanned the raw data numbers in the file. He walked over to a pair of tuning forks on an adjacent bench, striking the smaller one, then the larger one. The notes collided, creating a harsh, jagged vibration.
"The frequencies are fighting each other for the same pathway," Kai muttered, his eyes narrowing as he flipped through the packet logs. He expected to find a simple routing error. He didn't. He found a massive, chaotic mess of environmental interference metrics that defied standard arithmetic.
He stared at the numbers for a long, silent minute. His brow furrowed. He flipped back to the first page, re-calculating the atmospheric drag in his head, but the numbers refused to clean up.
"So, how do we separate the channels over that kind of distance, sir?" the engineer asked eagerly, leaning forward with his pen ready. "What's the equation to stabilize the long-range wave?"
Kai stared at the parchment a moment longer, then tossed the file back onto the workbench.
*"I don't know,"* Kai said bluntly.
The workshop went dead silent. The researchers blinked, completely thrown off. Kai *always* had a dismissive, five-word solution.
"Sir?" Tatsuya asked, bewildered. "But the layout—"
"The layout works perfectly under laboratory conditions," Kai interrupted, his voice dropping its usual lazy cadence. "But the regional ethernano density between Crocus and the plains isn't uniform. It shifts based on altitude, terrain, and localized magic storms. You aren't just dealing with frequency collision; you're dealing with environmental refraction. I can't calculate a counter-frequency because the interference pattern changes every ten miles."
He picked up a piece of chalk, stared at the blackboard for three seconds, and then set it back down without writing a single line.
"I need real-time field data," Kai admitted, crossing his arms. "I can't solve this on a blackboard. Tatsuya, pack these telemetry logs and the signal degradation charts into a transport crate. I'm taking them back to Magnolia with me. I need to study the regional decay constants along the railway line before I can even begin to guess at an answer. Leave the prototypes dismantled until further notice."
The engineers exchanged uneasy looks, but nodded slowly. The realization that even the Director was stumped cast a sobering weight over the room.
"Right," Kai muttered, stretching his arms until his spine popped, trying to shake off the mental fog. "That's enough manual labor for one day."
The heavy wooden doors of the workshop slammed open with a loud, resounding bang.
"Found you!"
Every researcher in the room collectively winced, instantly gluing their eyes to their workbenches to look intensely occupied. There was only one person in Crocus who breached restricted government labs with that specific brand of loud enthusiasm.
Princess Hisui marched into the hall, a neatly wrapped lunch basket hanging from each arm. She stopped, looking at the dozens of frozen, silent technicians. "Oh... did I interrupt a breakthrough?"
Kai's expression instantly collapsed into deep, existential exhaustion. "You interrupted a headache."
She completely ignored him, walking straight to his bench and dropping the baskets with a heavy thud. "I've been tracking you since noon, Kai. You've been in here since sunrise. You skipped breakfast, you skipped lunch, and the medical staff explicitly told me you aren't supposed to be running mana through your core today."
Siris quietly closed his ledger, tucked it under his arm, and began a slow, calculated retreat toward the side exit. "Greetings, Princess. I shall leave to archive these findings."
Kai glared at his back. "Coward. What happened to your legendary work ethic? You're leaving before the clock hits five."
Siris didn't even look back as he slipped through the door.
Hisui crossed her arms, giving Kai a stern look. "Director Sunveil. Your paperwork is done, your dangerous experiment is finished, and the project is at a standstill. You promised last week that the next time you came to the capital, you'd actually spend time with me."
Kai stared at her, weighed his options, and gave a slow nod. "Right. I said next time. So go away. Come back next time. I'm busy."
Hisui gave him a flat stare, then turned to the remaining staff with a bright, sweet smile. "Do you all mind taking an early leave today?"
The researchers didn't even hesitate. They grabbed their coats and vanished within ten seconds, eager to escape the lingering tension of the failed test.
Kai looked around the empty room. "Not a single one of you has any loyalty. Seriously?"
The lead engineer paused at the threshold, coughing into his palm. "Her Highness outranks you in the palace hierarchy, Director. My hands are legally tied by the constitution."
"Unbelievable," Kai muttered.
Hisui grabbed his sleeve, looking triumphant. "Excellent. Let's go, and don't try to slip into the shadows. I already told the palace guards to watch the corridors."
Kai grumbled under his breath as she pulled him toward the exit. "I'm still amazed your father hasn't stripped my title, considering how weird this looks. Don't you people have nosy nobles or parasitic relatives who complain about the princess hanging around a peasant?"
Hisui chuckled, leading him down the hallway. "You read too many trash novels, Kai. If any noble tried to say that to Father, it would be classified as defaming the crown. They'd be spending the night in a cell."
Kai smirked. "Good use of tyranny."
The royal capital of Crocus had a completely different rhythm than Magnolia. Magnolia was loud, chaotic, and aggressively alive—the kind of town where Fairy Tail regularly caused three million Jewels in structural damage on a random Tuesday. Crocus was elegant, orderly, and almost painfully civilized.
Kai shoved his hands deep into his coat pockets, keeping his slouch low as they walked down the wide marble avenue. Hisui had traded her heavy royal robes for a simple, casual sundress.
Neither of them spoke for a while, just letting the cool afternoon air settle between them. Finally, Hisui looked up. "You know... technically, you invited me out today."
Kai blinked down at her. "My memory must be failing me, because I don't remember that at all."
"You literally told me last time, 'Next time, Princess, I promise,'" she countered, shifting the baskets.
"That was a tactical retreat to stop you from crying," Kai corrected deadpan. "An exit strategy, not a social calendar event."
"To a normal human being, those are the exact same thing."
"Then it's a good thing I'm entirely detached from normalcy."
Hisui puffed her cheeks, shaking her head. "You are completely impossible."
"The doctors told me that five times before lunch," Kai noted. "I'm showing remarkable consistency."
She covered her face, letting out a soft laugh.
They crossed one of the city's flower bridges. Below the white stone, crystal-clear river water carried thousands of drifting, vibrant petals that caught the low golden light of the setting sun. Near the railings, a street musician was playing a slow melody on a lute.
Kai paused, staring at the ornate carvings along the side. "Expensive," he muttered.
Hisui looked around, confused. "What? The view? It's beautiful."
"The bridge," Kai said, pointing at a heavily decorative golden railing covered in detailed filigree. "That specific structural ornament alone probably cost enough to fund five primary schools in the outer districts for a year."
Hisui sighed, though her expression stayed warm. "You have a rare talent for ruining a romantic view with cold economics."
"I don't ruin it. I make it realistic. Beautiful things are rarely structurally efficient—unlike you."
Hisui froze, turning to face him. "...Did you just call me beautiful?"
Kai looked down at her, a small smirk playing on his lips. "...Did I? Must have been a calculation error."
Hisui pouted, and Kai just chuckled, turning back to the path.
"Princess Hisui!" a small voice gasped from the edge of the walkway.
A group of local children ran over, excited. A little girl in the front was holding a slightly messy, hand-woven crown made of wild lilies. She stepped forward shyly. "We... we made this by the river today."
Hisui's expression softened completely. She knelt right there on the polished marble, bringing herself down to the children's eye level without a second thought. "Oh, it's absolutely beautiful," she said softly, tilting her head forward. "May I wear it?"
The children nodded eagerly, and the girl carefully set the flower crown on top of the princess's dark hair. Kai watched from a few feet away, his hands still buried in his pockets, his face neutral.
A little boy in the group looked up at Kai's height, blinking. "Are you her bodyguard?"
Kai looked behind himself as if checking for an actual soldier, then looked back down at the kid. "Do I look like a bodyguard to you?"
The boy frowned, clearly lost. "Well... you're walking right next to the princess."
"I am also walking on a public road," Kai reasoned deadpan. "By that logic, you are also her bodyguard."
The child's brain completely short-circuited under the breakdown. Hisui burst out laughing, standing back up and adjusting the lilies. "Kai... stop it. You're confusing him."
Kai muttered something under his breath, then crouched down slightly to meet the boy's height. His golden eyes softened just a fraction. "I'm her friend. I just make sure she doesn't accidentally fall for some shady guy's words."
The boy's face cleared into a bright grin. "Oh!"
Kai stood back up, straightening his coat. "See? Clear communication."
They left the river district, entering the high-end commercial quarter filled with refined stone storefronts displaying enchanted silks and glowing jewelry. Hisui stopped in front of a small bakery. "Oh, they're open. I haven't been able to visit in weeks."
Kai followed her inside at an agonizingly slow pace. The elderly baker behind the counter smiled the moment the door chime rang. "Princess Hisui, a pleasure. The usual order?"
"Yes, please," she beamed.
The baker shifted his eyes to the tall, slouched youth by the door. "And for the Director?"
Kai gave a lazy nod. "Old man."
"Let me guess... the usual for you too?" the baker asked with an amused grin. "You complain about the price every time you cross my threshold, then you buy the exact same black coffee and sit in the exact same corner for two hours."
Kai considered it for a second. "...Your pastries are too sweet. It's a health hazard."
Hisui elbowed him in the ribs. Kai winced, and the baker just laughed.
A few minutes later, they were sitting outside under a wide white umbrella on the terrace. Hisui took a bite of a strawberry tart, while Kai just stared into the black depths of a plain porcelain cup.
"You didn't buy any actual food," Hisui pointed her fork at his side of the table.
"I bought coffee."
"That's a beverage, Kai. It doesn't count."
"It has calories, so it's food," Kai replied, taking a slow sip. "Besides, I bought a box of strawberry cakes for Erza."
She rolled her eyes. "I was asking about you. You eat like an overworked minimum-wage employee."
"I am an overworked minimum-wage employee."
Hisui watched him quietly, her playful tone dropping into something softer, more observant. "Did you really finish all of that administrative backlog last night?"
"...You don't believe me?"
She rested her chin on her hand. "Siris looked like he hadn't slept a single wink in forty-eight hours when I walked into the lab."
"He doesn't," Kai said smoothly. "I've told him many times that vacation time exists."
"Kai, it's because he knows if he leaves, you won't do a single thing and everyone else will follow your example."
"Then they need a better role model."
Hisui looked at him for a long, silent moment, the wind catching the ribbons of her dress. "Probably. But... I think they do it because everyone in the palace relies on you just a little bit too much."
Kai shrugged, his face remaining perfectly neutral. "Probably."
"Doesn't that ever bother you?" her voice dropped into a quieter register.
Kai stared into his cup, watching the dark liquid ripple. When he spoke, the usual sarcastic bite was entirely gone. "Sometimes. If people stop thinking for themselves because they expect you to always provide the solution... eventually, they forget how to think at all. They become entirely dependent on the architecture you build for them."
Hisui blinked, caught off guard by the weight in his voice. "And yet... you still solve every single problem they bring to your desk."
Kai looked up, a faint, self-deprecating smile touching his lips.
*"That's the curse of being good at calculations, Royal Bean,"* Kai said softly, his gaze drifting to the heavy crate of unsolved telemetry files resting near the door. *"You always know exactly what will collapse if you walk away. Even when you don't have the equations to fix it yet."*
The silence stretched between them, comfortable and heavy with an unspoken understanding.
"Thank you," she said softly.
"For what?"
"For continuing to try and fix things anyway."
He shifted in his seat, clearing his throat and picking up his cup again. "...You're welcome. Now stop staring into my eyes. It's unsettling."
By the time they finished their walk, the afternoon was bleeding into evening. Kai walked Hisui back toward the grand iron gates of Mercurius Palace, their pace slow and unhurried.
At the gate, Hisui stopped and turned to face him. "So... back to Magnolia now?"
Kai nodded, pulling the collar of his coat tight against the evening chill. "Obviously."
She let out a soft chuckle. "Come visit again soon, Kai."
"I inevitably will. The Crown owes me three more research grants."
"Preferably visit voluntarily next time. Without me having to threaten you with the medical staff."
"No promises, Princess," Kai said, offering a lazy, two-finger salute as he backed down the path. "Try not to accidentally invent any forbidden apocalypse magic while I'm away, Royal Bean."
Hisui folded her arms, a bright, confident smile on her face. "I make absolutely no guarantees about that, Director."
"That is exactly what keeps me awake at night," Kai muttered, turning on his heel toward the central station.
The evening train was already waiting at the platform when he arrived, thick plumes of white steam drifting around the iron locomotive. Kai climbed into a first-class government carriage, tossed his heavy leather coat onto the adjacent seat, and immediately stretched out across the entire length of the cushioned bench with a massive sigh of relief.
Beside his boots sat the heavy wooden crate filled with the broken long-distance data logs. He closed his eyes, his mind already drifting back to the unsolved variables of the environmental refraction problem. No ministers. No explosive test failures. Just a math problem he couldn't crack yet.
The loud train whistle cut through the dark station, and the heavy iron locomotive began rolling south. Back to Magnolia. Back to the absolute, predictable chaos of Fairy Tail. He thought he was heading back to a peaceful transition—but miles away, the guild was already burning.